feat: add imgui texture inspector (Thanks claude)

destrum/third_party/CMakeLists.txt

@@ -64,8 +64,32 @@ set(ASSIMP_BUILD_TESTS OFF CACHE BOOL "" FORCE)
 set(ASSIMP_INJECT_DEBUG_POSTFIX OFF CACHE BOOL "" FORCE)
 set(ASSIMP_INSTALL OFF CACHE BOOL "" FORCE)
 set(ASSIMP_WARNINGS_AS_ERRORS OFF CACHE BOOL "" FORCE)
+
+# assimp is unbearably slow unoptimized (a big FBX takes ~10s), so build it optimized even in Debug.
+# This only affects targets created inside the assimp directory (including its bundled zlib).
+set(DESTRUM_SAVED_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG}")
+set(DESTRUM_SAVED_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG}")
+if (MSVC)
+    foreach (flags_var CMAKE_C_FLAGS_DEBUG CMAKE_CXX_FLAGS_DEBUG)
+        string(REPLACE "/RTC1" "" ${flags_var} "${${flags_var}}")
+        string(REPLACE "/Od" "/O2" ${flags_var} "${${flags_var}}")
+        string(REPLACE "/Ob0" "/Ob2" ${flags_var} "${${flags_var}}")
+    endforeach ()
+else ()
+    string(APPEND CMAKE_C_FLAGS_DEBUG " -O2")
+    string(APPEND CMAKE_CXX_FLAGS_DEBUG " -O2")
+endif ()
+
 add_subdirectory(assimp)
 
+# assimp's own CMakeLists appends "/Od" to the Debug flags again, target options come later and win
+if (MSVC)
+    target_compile_options(assimp PRIVATE $<$<CONFIG:Debug>:/O2>)
+endif ()
+
+set(CMAKE_C_FLAGS_DEBUG "${DESTRUM_SAVED_C_FLAGS_DEBUG}")
+set(CMAKE_CXX_FLAGS_DEBUG "${DESTRUM_SAVED_CXX_FLAGS_DEBUG}")
+
 set(IMGUI_DIR "${CMAKE_CURRENT_LIST_DIR}/imgui")
 
 add_library(imgui STATIC